This week we continued to work on different ways to round numbers and estimate sums. The students were shown estimating to benchmarks, front-end estimating, compensation and compatible numbers. These are all strategies that will help them with mental math as well as a way to know if their answer is reasonable or not. We also talked about real life situations when we have seen or given estimations (i.e. the population of Canada, how many books there are in the learning commons etc.).
Next week we will continue to practice addition and explaining if our answer is reasonable or not and start to work on subtraction. The students are expected to know how to estimate to benchmarks and have at least one strategy that they use to estimate a sum or difference and use that to explain if their actual sum or difference is reasonable or not. There will be a test coming up in the last week of October/first week of November. The students need to remember standard form, expanded form, written form, the value of digits in large numbers, how to tell when numbers are greater than or less than other numbers, estimating and be able to explain their process, adding and subtracting, solving a word problem and explaining their process.
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